September weather forecastHeistad, Norway
September
Weather in September
The first month of the autumn, September, is still a mild month in Heistad, Norway, with an average temperature fluctuating between 9.3°C (48.7°F) and 15.3°C (59.5°F).Temperature
A mild shift in the average high-temperature occurs in September, reducing from a refreshing 18.7°C (65.7°F) in August to a moderate 15.3°C (59.5°F). During September, the nighttime temperature averages to a frosty 9.3°C (48.7°F).Humidity
In September, the average relative humidity is 78%.Rainfall
In September, the rain falls for 10.6 days. Throughout September, 53mm (2.09") of precipitation is accumulated. In Heistad, during the entire year, the rain falls for 114.5 days and collects up to 470mm (18.5") of precipitation.Snowfall
In Heistad, snow does not fall in June through September.Daylight
In Heistad, Norway, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 06:19 and sunset at 20:22. On the last day of September, sunrise is at 07:25 and sunset at 18:57 CEST.
Sunshine
The average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 3 in September suggests the following recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Heistad, Norway
- Average high temperature in September: 15.3°C
The warmest month (with the highest average high temperature) is July (19.4°C).
The month with the lowest average high temperature is January (-0.2°C).
- Average low temperature in September: 9.3°C
The month with the highest average low temperature is July (12.5°C).
The coldest month (with the lowest average low temperature) is February (-4°C).
Average pressure in September
Heistad, Norway
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is April (1014.5mbar).
The month with the lowest atmospheric pressure is December (1007.9mbar).
Average wind speed in September
Heistad, Norway
- Average wind speed in September: 14km/h
The windiest month (with the highest average wind speed) is December (16.2km/h).
The calmest months (with the lowest average wind speed) are July and August (11.8km/h).
Average humidity in September
Heistad, Norway
- Average humidity in September: 78%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Heistad, Norway
- Average rainfall in September: 53mm
The wettest month (with the highest rainfall) is November (57mm).
The driest month (with the least rainfall) is April (17mm).
Average rainfall days in September
Heistad, Norway
- Average rainfall days in September: 10.6 days
The months with the highest number of rainy days are June and August (12.9 days).
The month with the least rainy days is January (4.3 days).
Average snowfall in September
Heistad, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is January (168mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Heistad, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Heistad, Norway
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 24min).
The month with the shortest days is December (Average daylight: 6h and 18min).
- Average sunshine in September: 7h and 54min
The month with the most sunshine is June (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 12min).
Average sunshine days in September
Heistad, Norway
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is April (20.5 days).
The month with the least sunshine days is February (14.7 days).
Average UV index in September
Heistad, Norway
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover in September
Heistad, Norway
- Average cloud cover in September: 44
The months with the most cloud cover are February and November (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in September
Heistad, Norway
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The month with the lowest visibility is February (8km).
